// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_ANDROID_EDGE_EFFECT_L_H_
#define UI_ANDROID_EDGE_EFFECT_L_H_

#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "ui/android/edge_effect_base.h"
#include "ui/android/ui_android_export.h"
#include "ui/gfx/geometry/rect_f.h"
#include "ui/gfx/geometry/size.h"

namespace cc {
class Layer;
class UIResourceLayer;
}

namespace ui {
class ResourceManager;
}

namespace ui {

// |EdgeEffectL| mirrors its Android L counterpart, EdgeEffect.java.
// Conscious tradeoffs were made to align this as closely as possible with the
// the original Android java version.
// All coordinates and dimensions are in device pixels.
class UI_ANDROID_EXPORT EdgeEffectL : public EdgeEffectBase {
public:
    explicit EdgeEffectL(ui::ResourceManager* resource_manager);
    ~EdgeEffectL() override;

    void Pull(base::TimeTicks current_time,
        float delta_distance,
        float displacement) override;
    void Absorb(base::TimeTicks current_time, float velocity) override;
    bool Update(base::TimeTicks current_time) override;
    void Release(base::TimeTicks current_time) override;

    void Finish() override;
    bool IsFinished() const override;
    float GetAlpha() const override;

    void ApplyToLayers(Edge edge,
        const gfx::SizeF& viewport_size,
        float offset) override;
    void SetParent(cc::Layer* parent) override;

    // Thread-safe trigger to load resources.
    static void PreloadResources(ui::ResourceManager* resource_manager);

private:
    ui::ResourceManager* const resource_manager_;

    scoped_refptr<cc::UIResourceLayer> glow_;

    float glow_alpha_;
    float glow_scale_y_;

    float glow_alpha_start_;
    float glow_alpha_finish_;
    float glow_scale_y_start_;
    float glow_scale_y_finish_;

    gfx::RectF arc_rect_;
    gfx::Size bounds_;
    float displacement_;
    float target_displacement_;

    base::TimeTicks start_time_;
    base::TimeDelta duration_;

    State state_;

    float pull_distance_;

    DISALLOW_COPY_AND_ASSIGN(EdgeEffectL);
};

} // namespace ui

#endif // UI_ANDROID_EDGE_EFFECT_L_H_
